Re: New Build 66cc Engine is slow and will not idle at all
Drop the needle as far down as it will go(clip in top slot). If this is not enough, you will need a smaller jet. I'd do a plug chop first to see if it is really too rich. Search "plug chop" if you don't know how.
If more is better, then too much is just enough.
If you can't afford it, build it yourself.